Stef Lewandowski
London, England, United Kingdom
Summary
👤
SeniorStef Lewandowski is a fractional CTO, startup advisor and product-driven engineer with 15 years of experience turning early-stage ideas into production SaaS and AI products. He excels at rapid prototyping and taking concepts from "zero to one," having built and led teams across ventures in finance, education, sustainability, logistics and more. Notable outcomes include leading On Deck’s platform through hypergrowth, architecting Oak National Academy’s award-winning learning platform that served millions during COVID, and building Translucent’s data-warehouse-first CFO platform. Stef blends hands-on full‑stack craftsmanship (TypeScript, Next.js, React, serverless, Snowflake/Postgres) with venture-building instincts and practical data engineering. He mentors and advises AI startups and has shipped one of the UK’s early production generative-AI education services, while also serving on an industrial advisory board and exploring LLM experiments in his spare time.
16 years of coding experience
Stackoverflow
14,230reputation
1.9mreached
273answers
9questions
ruby-on-rails
top-5%
jquery
top-5%
http
top-5%
rspec
top-5%
javascript
top-5%
ruby
top-1%
Github Skills (181)
postgresql10
ruby10
hybrid10
browser10
react-framework10
pipeline10
compiler10
bigquery10
mysql10
static-site-generator10
java10
ssg10
cube10
vercel10
snowflake10
Programming languages (11)
Github contributions (5)
Foundrsco/foundrs-website
Aug 2018 - Sep 2018
Contributions:88 commits, 74 pushes, 1 branch in 1 month
lendyme/app
May 2015 - Aug 2015
Contributions:115 pushes, 3 branches in 3 months
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